Zipp engineers like all their gear as advanced as possible. That's why they drink out of these Zipp Purist Water Bottles made by Specialized. Specialized has put as much attention into improving the lowly bottle as Zipp puts into their wheels. The idea behind the Purist was a bottle that was as pure as drinking from glass with a form that was flexible like a regular water bottle, with a top that holds water in but is easy to get out. The bottle's interior is coated with silicon dioxide. This makes it harder for mold and mildew to take root and nit all but eliminates odors for sitting inside your bottle. The bottle itself is BPA and Phthalate free, so there are two less things you have to worry about. The screw top lid possesses the WaterGate top that really seals when closed and allows amazing flow when open. The bottle is available in both 22- and 26-ounce sizes. The minimalist Grey bottle is on both sizes, while the Yellow "Disc" bottle and Red "Firecrest" bottle. The Zipp Purist Bottle, the only one good enough to get the Zipp name.